GM Full-Size Trucks 1970-1979 Repair Guide

Coil Spring

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REMOVAL & INSTALLATION



See Figure 1



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Fig. Fig. 1: A spring compressor must be used when removing the coil spring


CAUTION
Coil springs are under considerable tension. Be very careful when removing and installing them; they can exert enough force to cause serious injury.

  1. Raise and safely support the truck under the frame rails. The control arms should hang free.
  2.  
  3. Disconnect the shock absorber at the lower end and move it aside. Disconnect the stabilizer bar from the lower control arm.
  4.  
  5. Support the cross-shaft and install a spring compressor or chain the spring to the control arm as a safety precaution.
  6.  
  7. Raise the jack to remove the tension from the lower control arm cross-shaft and remove the two U-bolts securing the cross-shaft to the crossmember.
  8.  


CAUTION
The cross-shaft and lower control arm keeps the coil spring compressed. Use care when you lower the assembly.

  1. Slowly release the jack and lower the control arm until the spring can be removed. Be sure that all compression is relieved from the spring.
  2.  
  3. Remove the spring.
  4.  
  5. Installation is the reverse of removal, with the following recommendations: Position the control arm cross-shaft on the crossmember and install the U-bolts. Be sure that the front indexing hole in the cross-shaft is aligned with the crossmember attaching saddle stud.
  6.  
  7. Tighten the U-bolts to 45 ft. lbs. (61 Nm) for 1970-75 1 / 2 ton trucks, to 110 ft. lbs. (149 Nm) for 3 / 4 and 1 ton models; all other trucks tighten to 85 ft. lbs. (115 Nm). Have the front suspension alignment checked.
  8.  

 
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